Computational modeling of air-breathing microfluidic fuel cells with flow-over and flow-through anodes

被引：72

作者：

Zhang, Biao ^{[1
,2
,4
]}

Ye, Ding-ding ^{[1
,2
]}

Sui, Pang-Chieh ^{[3
]}

Djilali, Ned ^{[3
,4
]}

Zhu, Xun ^{[1
,2
]}

机构：

[1] Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China

[2] Chongqing Univ, Inst Engn Thermophys, Chongqing 400030, Peoples R China

[3] Univ Victoria, Inst Integrated Energy Syst IESVic, Victoria, BC V8W 3P6, Canada

[4] Univ Victoria, Dept Mech Engn, Victoria, BC V8W 3P6, Canada

来源：

JOURNAL OF POWER SOURCES | 2014年 / 259卷

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

Microfluidic fuel cell; Membraneless fuel cell; Air-breathing; Flow-through; Flow-over; Mass transport; LAMINAR-FLOW; METHANOL; PERFORMANCE; TRANSPORT; CROSSOVER;

D O I：

10.1016/j.jpowsour.2014.02.076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A three-dimensional computational model for air-breathing microfluidic fuel cells (AMFCs) with flow-over and flow-through anodes is developed. The coupled multiphysics phenomena of fluid flow, species transport and electrochemical reactions are resolved numerically. The model has been validated against experimental data using an in-house AMFC prototype with a flow-through anode. Characteristics of fuel transfer and fuel crossover for both types of anodes are investigated. The model results reveal that the fuel transport to the flow-over anode is intrinsically limited by the fuel concentration boundary layer. Conversely, fuel transport for the flow-through anode is convectively enhanced by the permeate flow, and no concentration boundary layer is observed. An unexpected additional advantage of the flow-through anode configuration is lower parasitic (crossover) current density than the flow-over case at practical low flow rates. Cell performance of the flow-through case is found to be limited by reaction kinetics. The present model provides insights into the fuel transport and fuel crossover in air-breathing microfluidic fuel cells and provides guidance for further design and operation optimization. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：15 / 24

页数：10

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